JP2006313119A - Measuring device for bending of rod-shaped body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bending measuring apparatus for a rod-shaped body which can measure true bending of a rod-shaped body. <P>SOLUTION: The bending measuring apparatus has a pair of or a plurality of pairs of displacement detection means 3 for detecting, in a plane perpendicular to the transfer direction of a rod-shaped body a which is transferred in the longitudinal direction, the displacement of the rod-shaped body in a first and second direction which cross each other. The apparatus further comprises V-shaped guide rolls 1a, 1b for supporting the rod-shaped body a from below which are placed at least immediately upstream and downstream of the displacement detection means 3. The attitude of the V-shaped guide rolls 1a, 1b is allowed to follow the bending of the horizontal component of the rod-shaped body a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for measuring a bending amount of a rod-shaped body such as a steel bar or a tube rod while conveying it in the longitudinal direction.

  For example, an apparatus described in Patent Document 1 is known as an apparatus for measuring the amount of bending while conveying a rod-shaped body such as a steel bar or tube bar in the longitudinal direction. As shown in FIG. 5 (same as FIG. 1 of Patent Document 1), the apparatus disclosed in the document includes a first and a second crossing each other in a plane perpendicular to the conveying direction of the rod-shaped body along the conveying path. At least three sets of displacement detecting means for detecting the displacement of the rod-shaped body in the two directions are arranged, and the amount of bending per unit length is measured at a predetermined pitch. Here, at least three sets of displacement detection means are arranged because the reference point for measuring the bending is not the point where the bar-shaped material contacts the front and rear guide rolls, and FIG. 6 (same as FIG. 4 of Patent Document 1). This is because the bending amount (S1) is obtained by calculating from each displacement amount as shown in FIG. In addition, the shape of the guide roll and the support structure of the document are not specifically disclosed.

JP 2000-161944

  In the above prior art apparatus, at least three sets of displacement detection means for detecting the displacement of the rod-shaped bodies in the first and second directions intersecting each other in a plane perpendicular to the conveyance direction of the rod-shaped bodies are arranged along the conveyance path. In addition to the complicated and expensive equipment configuration and computation, the guide roll may correct the bending of the rod-like body depending on the shape and support structure of the guide roll. There is a problem that it is not possible to measure the bend.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bending measurement apparatus for a rod-like body that can measure the true bending of the rod-like body and that does not require the arrangement of three or more sets of the displacement detection means. is there.

  In order to solve the above-mentioned problems, the inventors of the present application have focused on the guide rolls disposed before and after the displacement detection means, and have devised the present invention to make the shape and support structure appropriate. According to the present invention, there is provided one or a plurality of sets of displacement detection means for detecting the displacement of the rod-shaped bodies in the first and second directions intersecting each other in a plane orthogonal to the conveyance direction of the rod-shaped bodies conveyed in the longitudinal direction. In the bending measuring apparatus, a V-shaped guide roll for supporting the rod-shaped body from below is provided at least on the upstream side and the downstream side closest to the displacement detecting means, and the posture of the V-shaped guide roll is set to the horizontal position of the rod-shaped body. Provided is a rod-shaped bending measuring device configured to be able to follow the bending of a directional component.

  The V-shaped guide roll has a spherical bush fitted between a roll body having a V-shaped continuous groove formed on the peripheral surface and a rotating shaft, and an elastic body that contacts both side surfaces of the roll body. By supporting the elastic body with a member fixed to the rotating shaft, the roll body may be structured to be tiltable with respect to the rotating shaft.

  Furthermore, you may provide the pinch roll which hold | suppresses a rod-shaped body to a V-shaped guide roll from the upper part on the said V-shaped guide roll. In this case, the pinch roll may have a structure in which a roll body having a flat peripheral surface is mounted in a state where the roll body is not tilted with respect to the rotation shaft, and the pinch roll is a roll having a V-shaped continuous groove formed on the peripheral surface. A structure in which the main body is attached to be tiltable with respect to the rotation shaft may be used.

  According to the present invention, the bending of the rod-shaped body is performed regardless of the number of installed sets of displacement detecting means for detecting the displacement of the rod-shaped body in the first and second directions intersecting each other in a plane orthogonal to the conveying direction of the rod-shaped body. It is possible to provide a bending measurement device for a rod-like body that can be measured with high accuracy.

First, the reasons for defining the present invention will be described.
An apparatus for measuring the bending of a rod-shaped body, which is a subject of the present invention, is a set for detecting rod-shaped body displacements in a first direction and a second direction that intersect each other in a plane orthogonal to the conveying direction of the rod-shaped body conveyed in the longitudinal direction. Or it is a bending measuring device which has a plurality of sets of displacement detection means.

  Here, the rod-shaped body refers to a long material having a circular cross-sectional shape such as a steel bar or a tube rod. The displacement detecting means for detecting the displacement of the rod-shaped body in the first and second directions intersecting each other in a plane orthogonal to the conveyance direction of the rod-shaped body conveyed in the longitudinal direction is that the bending of the rod-shaped body is always in a constant direction. Instead, since the bending is also performed in the two-dimensional direction, it is possible to accurately measure the bending and to efficiently use the bending measuring apparatus having the above-described configuration. The number of installed sets of displacement detection means may be three or more as disclosed in Patent Document 1, or may be one set as shown in FIG. 1 for reasons described later. Further, two sets may be used, and the number of installed sets is not limited. A calculation method for obtaining the amount of bending will be described in detail later.

  An essential feature of the present invention is that a V-shaped guide roll for supporting the rod-shaped body from below is provided at least on the upstream side and the downstream side closest to the displacement detecting means, and the posture of the V-shaped guide roll is determined by the rod-shaped body. It is configured to be able to follow the bending of the horizontal component of. The V-shaped guide roll has a V-shaped groove on a plane including a roll rotation axis on the circumferential surface of the roll.

  In order to accurately measure the bending of the rod-shaped body conveyed in the longitudinal direction, it is necessary to stabilize the position of the conveyance path passing through the displacement detection means, and at least the upstream side and the downstream side closest to the displacement detection means. By using a V-shaped guide roll as a guide roll that supports the rod-shaped body from below, the rod-shaped material is caused by its own weight to be at the lowest point of the V-shaped groove (a rod-shaped material having a circular cross-sectional shape is placed on the left and right side surfaces of the V-shaped groove). When the abutting force is applied to the V-shaped guide rolls arranged on the upstream side and the downstream side closest to the displacement detecting means, the rod-like material is always the same. Will pass the position. Thereby, the conveyance path of the stable position can be obtained. In addition, by configuring the posture of the V-shaped guide roll to be able to follow the bending of the horizontal component of the rod-shaped body, the bending correction force does not act on the rod-shaped body, and the original bending of the rod-shaped body is not caused. In addition to being able to measure correctly, the conveyance path at the lowest point of the V-shaped guide roll can be obtained more stably. Since the upstream and downstream guide rolls closest to the displacement detection means are configured as described above, when measuring the bending of the rod-shaped body, the upstream and downstream V-shaped guide rolls closest to the displacement detection means. By using the lowest point as a reference point, it is possible to accurately measure the bend even with one set of displacement detection means.

  In addition, a pinch roll that presses the rod-shaped body onto the V-shaped guide roll from above is provided, and the posture of the pinch roll is configured to be able to follow the bending of the horizontal component of the rod-shaped body. A conveyance path at a point can be obtained more accurately and stably. Moreover, the pinch roll can suppress bending due to its own weight when the front and rear ends of the rod-like body are in a cantilever state. If the peripheral surface of the pinch roll is made flat, it is possible to prevent the bending correction force from being applied to the rod-shaped material even if the posture is not configured to be able to follow the bending of the horizontal component of the rod-shaped body. Further, the pinch roll may have a structure in which a pinch roll main body having a V-shaped continuous groove formed on the peripheral surface is attached so as to be tiltable with respect to the rotation shaft.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the overall configuration of a bending measuring apparatus according to an embodiment of the present invention.

  The distance detector 3a for measuring the position of the rod-shaped body a in the X direction (horizontal direction in FIG. 1) and the Y direction (in the horizontal direction in FIG. 1) in a plane orthogonal to the transport direction (the material passing direction) of the rod-shaped body a transported in the longitudinal direction ( Displacement detecting means 3 composed of a pair of distance detectors 3a and 3b orthogonal to the distance detector 3b for measuring the position of the rod-shaped body a (vertical direction in FIG. 1) is arranged. These distance detectors 3a and 3b employ a configuration in which the position of the rod-shaped body a is optically detected using, for example, a projector and a light receiver.

  V-shaped guide rolls 1a and 1b having V-shaped continuous grooves formed on the peripheral surface on the upstream side and the downstream side closest to the displacement detection means 3 are spaced apart from the displacement detection means 3 by L / 2. is set up. Each V-shaped guide roll 1a, 1b is installed on the lower side of the rod-shaped body a so as to support the rod-shaped body a from below. 1 shows a state in which one V-shaped guide roll 1a, 1b is provided on each of the upstream side and the downstream side of the displacement detecting means 3, but the upstream side and the downstream side of the displacement detecting means 3 are shown. In addition to the V-shaped guide rolls 1a and 1b, one or more other guide rolls may be installed. However, in any case, the V-shaped guide roll 1a is installed at the closest position upstream of the displacement detection means 3, so that the displacement detection means 3 and the V-shape are upstream of the displacement detection means 3. There is no other guide roll between the guide rolls 1a. Similarly, a V-shaped guide roll 1b is installed at a position closest to the downstream side of the displacement detection means 3, so that the displacement detection means 3 and the V-shaped guide roll 1b are located downstream of the displacement detection means 3. There must be no other guide rolls in between. By installing the displacement detecting means 3 and the two V-shaped guide rolls 1a and 1b in this way, the rod-shaped material a is always in contact with the upstream and downstream V-shaped guide rolls 1a and 1b. It passes through the same position, and the bending of the rod-shaped material a can be accurately detected by the displacement detection means 3 installed between the V-shaped guide rolls 1a and 1b.

  In the illustrated form, pinch rolls 2a and 2b are respectively provided on the upper portions of the V-shaped guide rolls 1a and 1b. Here, the relationship between the V-shaped guide roll 1a and the pinch roll 2a arranged on the upstream side of the displacement detecting means 3, and the relationship between the V-shaped guide roll 1b and the pinch roll 2b arranged on the downstream side of the displacement detecting means 3 are shown. Since the relationship is substantially the same, the V-shaped guide roll 1a and the pinch roll 2a arranged on the upstream side of the displacement detection means 3 will be described as a representative.

  FIG. 2 shows a cross section including rotation axes of the V-shaped guide roll 1a and the pinch roll 2a. A spherical bush 13 is fitted between the roll body 11 and the rotating shaft 12 of the V-shaped guide roll 1a, and O-rings 14 which are elastic bodies are in contact with both side surfaces of the roll body 11 to rotate. Both side surfaces of the roll main body 11 are supported via O-rings 14 by bosses 15 fixed to the shaft 12. This structure can prevent the roll body 11 from tilting following the bending of the horizontal component in the rod-shaped body a and applying a correction force to the rod-shaped body a.

  As shown in FIG. 2, the pinch roll 2 a has a structure in which a roll body 21 having a flat peripheral surface is attached in a state where the roll body 21 is not tilted with respect to the rotation shaft 22. Since the peripheral surface of the pinch roll 2a is flat, even if the roll main body 21 is fixed to the rotating shaft 22, the horizontal component bending of the rod-shaped body a does not cause a correction force.

  Further, the pinch roll 2a may be pressed downward by a biasing means (not shown). By doing so, not only the weight of the rod-shaped material a but also the pressing force of the pinch roll 2a makes the rod-shaped material a the lowest point of the V-shaped groove of the V-shaped guide roll 1a (the rod-shaped material a having a circular cross section is (The lowest point in contact with the left and right side surfaces of the V-shaped groove), the rod-shaped material a can more easily pass through the same position when contacting the V-shaped guide roll 2a. Bending can be measured with higher accuracy.

  The V-shaped guide roll 1a and the pinch roll 2a arranged on the upstream side of the displacement detection means 3 have been described as a representative. However, the V-shaped guide roll 1b and the pinch roll arranged on the downstream side of the displacement detection means 3 are explained. The relationship between the rolls 2b is substantially the same.

  Next, the function of the bending measuring apparatus according to the embodiment of the present invention will be described. FIG. 3: has shown the top view for demonstrating the case where the bending of the rod-shaped material a is measured by the bending measuring apparatus concerning embodiment of this invention. FIG. 3A shows a conveying state when the rod-shaped body a is a straight line (without bending), and the V-shaped guide rolls 1a and 1b support the rod-shaped body a from below and guide it horizontally. . On the other hand, FIG. 3B shows a state when the rod-shaped body a is conveyed with a bend, and the roll body 11 of the V-shaped guide roll 1a and the roll body 11 of the V-shaped guide roll 1b. Respectively follow the bending of the horizontal component of the rod-shaped body a and appropriately tilt with respect to the axis 12 of the rotating shaft, thereby preventing the correction force applied to the rod-shaped body a. If the rod-like body a is not bent, it can be centered by the repulsive force of the O-ring 14 which is an elastic body shown in FIG. 2, and can return to the state shown in FIG.

In this bending measuring device, as shown in FIG. 3 (a), the X of the rod-shaped body a measured by the distance detectors 3a, 3b of the displacement detecting means 3 when the uncurved rod-shaped body a is conveyed. The direction and the position in the Y direction are determined as reference values. Then, as shown in FIG. 3B, when the rod-shaped body a having a bend is conveyed, the positions of the rod-shaped body a in the X direction and the Y direction are measured by the distance detectors 3a and 3b of the displacement detecting means 3, respectively. , Differences dx and dy from a predetermined reference value are obtained. Then, the bending amount S can be obtained by the following equation (1).
S = √dx ² + dy ² (1)

  As mentioned above, although one Example of this invention was described, this invention is not limited to the form of illustration. For example, FIGS. 1 and 2 show an example in which pinch rolls 2a and 2b having a flat peripheral surface are provided on the V-shaped guide rolls 1a and 1b, but the pinch rolls 2a and 2b are formed as V-shaped guide rolls 1a. 1b, a roll body having a V-shaped continuous groove formed on the peripheral surface may be attached so as to be tiltable with respect to the rotation axis. Even if the pinch rolls 2a and 2b are formed with V-shaped continuous grooves in the same manner as the V-shaped guide rolls 1a and 1b, the pinch rolls 2a and 2b are corrected to the rod-shaped body a if the roll body can be tilted with respect to the rotation axis. Similarly, it is possible to prevent the force from being applied.

  Moreover, the pinch rolls 2a and 2b are not necessarily essential, and the pinch rolls 2a and 2b may be omitted.

  Next, using the measuring device shown in FIG. 1, the measurement accuracy of the amount of bending depending on whether or not the V-shaped guide rolls 1a and 1b have a function of following the horizontal component bending and whether or not there is a pinch roll was compared and investigated. A steel bar having a diameter of 50 mmΦ and a length of 10 m was used as a test material.

In FIG. 1, L is set to 1 m, and the V-shaped guide roll is determined by the edge position of the rod-shaped body a in the X direction measured by the distance detector 3a and the edge position of the rod-shaped body a in the Y direction measured by the distance detector 3b. The displacements dx and dy in the X and Y directions of the rod-shaped body a with respect to the reference line obtained in advance based on the edge position of the rod-shaped body a at the lowest point of the V-shaped grooves 1a and 1b are respectively obtained. The bending amount S was obtained from the equation (1).
S = √dx ² + dy ² (1)

FIG. 4 shows the results of investigation by measuring the bending amount S of the rod-shaped body at intervals of 1 mm every 5 mm pitch, and obtaining the measurement error range P of the maximum bending amount by the following equation (2).
P = (measured value−actual value) / actual value × 100 (%) (2)

  Here, the measured value is a value measured by the above-described bending measuring apparatus and method of the rod-shaped body, and the actually measured value is a value measured by a dial gauge while supporting the rod-shaped body by a horizontally arranged V block.

  In FIG. 4, the comparative example is an example in which the V-shaped guide roll does not have a function of following the horizontal component bending, and no pinch roll is provided. Inventive example 1, the V-shaped guide roll is horizontal. An example in which a pinch roll is not provided but a pinch roll is provided, and Invention Example 2 is an example in which a V-shaped guide roll has a function to follow a horizontal component bend and a pinch roll is provided. is there.

  It can be seen that the measurement error range is greatly reduced by causing the V-shaped guide roll to follow the bending of the rod-shaped body, and that a further error range reduction effect can be obtained by providing a pinch roll.

  The present invention can be used to measure the amount of bending of a rod-shaped body such as a steel bar or tube bar.

It is explanatory drawing which shows the whole structure of the bending measuring apparatus concerning embodiment of this invention. It is sectional drawing which shows the structure of a V-shaped guide roll and a pinch roll. It is a top view explaining the function of the bending measuring device concerning an embodiment of the invention. It is the graph which showed the measurement error of the example of the present invention and the comparative example. It is a figure which shows a conventional apparatus. It is a flowchart which shows the arithmetic processing in the case of calculating | requiring bending amount S1 per unit length of the rod-shaped body in a conventional apparatus.

Explanation of symbols

1a, 1b V-shaped guide roll 11 V-shaped guide roll roll body 12 V-shaped guide roll rotating shaft 13 Spherical bush 14 O-ring 15 Boss 2a, 2b Pinch roll 21 Pinch roll roll body 3 Displacement detecting means 3a Distance detector 3b for measuring the position of rod-shaped body a in the X direction Distance detector for measuring the position of rod-shaped body a in the Y direction

Claims (5)

In a bending measuring apparatus having one or a plurality of sets of displacement detecting means for detecting rod-shaped body displacements in first and second directions intersecting each other in a plane perpendicular to the conveying direction of the rod-shaped body conveyed in the longitudinal direction, A V-shaped guide roll for supporting the rod-shaped body from below is provided at least on the upstream side and the downstream side closest to the displacement detection means, and the posture of the V-shaped guide roll follows the bending of the horizontal component of the rod-shaped body. An apparatus for measuring bending of a rod-shaped body, characterized in that it is configured to be possible. The V-shaped guide roll has a spherical bush fitted between a roll body having a V-shaped continuous groove formed on the peripheral surface and a rotating shaft, and an elastic body that contacts both side surfaces of the roll body. 2. The apparatus for measuring bending of a rod-shaped body according to claim 1, wherein the roll body is tilted with respect to the rotation axis by supporting the elastic body with a member fixed to the rotation axis. Furthermore, the bending measurement apparatus of the rod-shaped body of Claim 1 or 2 provided with the pinch roll which hold | suppresses a rod-shaped body to a V-shaped guide roll from the upper part on the said V-shaped guide roll. 4. The apparatus for measuring bending of a rod-shaped body according to claim 3, wherein the pinch roll is attached with a roll body having a flat peripheral surface not tilted with respect to the rotation axis. The said pinch roll was made into the structure which attached the roll main body in which the V-shaped continuous groove was formed in the surrounding surface so that tilting with respect to a rotating shaft was possible, The bending measuring apparatus of the rod-shaped body of Claim 3 characterized by the above-mentioned.

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